Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 28 - Self-Quiz - Page 480: 10


c. both a and b

Work Step by Step

The waxy cuticle layer effectively prevents water loss and gas exchange when the stomata are closed. Epidermal cells secrete a substance that contains waxes, pectin, and cellulose fibers sitting within a polymer called cutin; this substance forms a barrier to prevent water from leaving the plant. Additionally, the cuticle prevents the exchange of oxygen and carbon dioxide in the plant, provided the stomata are closed.
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